| commit | author | age | ||
| a6c014 | 1 | /** |
| L | 2 | Copyright 2018 Google Inc. All rights reserved. |
| 3 | ||
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | you may not use this file except in compliance with the License. | |
| 6 | You may obtain a copy of the License at: | |
| 7 | ||
| 8 | http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | ||
| 10 | Unless required by applicable law or agreed to in writing, software | |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | See the License for the specific language governing permissions and | |
| 14 | limitations under the License. | |
| 15 | */ | |
| 16 | ||
| 17 | #import "FBLPromise.h" | |
| 18 | ||
| 19 | NS_ASSUME_NONNULL_BEGIN | |
| 20 | ||
| 21 | @interface FBLPromise<Value>(ReduceAdditions) | |
| 22 | ||
| 23 | typedef id __nullable (^FBLPromiseReducerBlock)(Value __nullable partial, id next) | |
| 24 | NS_SWIFT_UNAVAILABLE(""); | |
| 25 | ||
| 26 | /** | |
| 27 | Sequentially reduces a collection of values to a single promise using a given combining block | |
| 28 | and the value `self` resolves with as initial value. | |
| 29 | ||
| 30 | @param items An array of values to process in order. | |
| 31 | @param reducer A block to combine an accumulating value and an element of the sequence into | |
| 32 | the new accumulating value or a promise resolved with it, to be used in the next | |
| 33 | call of the `reducer` or returned to the caller. | |
| 34 | @return A new pending promise returned from the last `reducer` invocation. | |
| 35 | Or `self` if `items` is empty. | |
| 36 | */ | |
| 37 | - (FBLPromise *)reduce:(NSArray *)items | |
| 38 | combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE(""); | |
| 39 | ||
| 40 | /** | |
| 41 | Sequentially reduces a collection of values to a single promise using a given combining block | |
| 42 | and the value `self` resolves with as initial value. | |
| 43 | ||
| 44 | @param queue A queue to dispatch on. | |
| 45 | @param items An array of values to process in order. | |
| 46 | @param reducer A block to combine an accumulating value and an element of the sequence into | |
| 47 | the new accumulating value or a promise resolved with it, to be used in the next | |
| 48 | call of the `reducer` or returned to the caller. | |
| 49 | @return A new pending promise returned from the last `reducer` invocation. | |
| 50 | Or `self` if `items` is empty. | |
| 51 | */ | |
| 52 | - (FBLPromise *)onQueue:(dispatch_queue_t)queue | |
| 53 | reduce:(NSArray *)items | |
| 54 | combine:(FBLPromiseReducerBlock)reducer NS_SWIFT_UNAVAILABLE(""); | |
| 55 | ||
| 56 | @end | |
| 57 | ||
| 58 | /** | |
| 59 | Convenience dot-syntax wrappers for `FBLPromise` `reduce` operators. | |
| 60 | Usage: promise.reduce(values, ^id(id partial, id next) { ... }) | |
| 61 | */ | |
| 62 | @interface FBLPromise<Value>(DotSyntax_ReduceAdditions) | |
| 63 | ||
| 64 | - (FBLPromise * (^)(NSArray *, FBLPromiseReducerBlock))reduce FBL_PROMISES_DOT_SYNTAX | |
| 65 | NS_SWIFT_UNAVAILABLE(""); | |
| 66 | - (FBLPromise * (^)(dispatch_queue_t, NSArray *, FBLPromiseReducerBlock))reduceOn | |
| 67 | FBL_PROMISES_DOT_SYNTAX NS_SWIFT_UNAVAILABLE(""); | |
| 68 | ||
| 69 | @end | |
| 70 | ||
| 71 | NS_ASSUME_NONNULL_END | |
